Will my new travel portal show up on Google, or do I have to do something myself to get customers to find it?

No, a brand new portal will not simply appear in Google results on its own, and getting found is work that you or someone you hire will need to keep doing. What the portal gives you is a proper website on your own domain, with pages a search engine can read, page titles and descriptions you control, and text you can write in your own words. Discovery and ranking are then up to the search engine, which weighs your site against others that may have been publishing for years.

The technical side is where we can help. Your site can be submitted to Google through their own free webmaster tools, your pages carry the titles and wording you choose, and everything works properly on a phone as well as a computer. Live search result pages, the ones built fresh the moment a customer types a city and a date, are not usually the pages that rank. The pages that bring visitors in are the ones you write yourself, about the destinations you sell, the tours you run, the visa or holiday questions your customers keep asking.

Be realistic about how long this takes. It depends on your domain, whether it is new or has history, how much competition there is for the searches you want, and how much fresh writing you do. Nobody can promise you a position in the results. Paid search advertising is the quicker route to traffic while the free listings build up, but that is a budget you would run yourself.

A sensible first step is to settle your domain name, then write a small set of honest pages about what you actually sell, and submit the site to Google so it knows you exist.